Microsoft issued an emergency security patch for a critical vulnerability in Windows that is already being exploited in the wild. This update matters because the flaw allows attackers to gain full SYSTEM-level control over affected machines without needing special conditions. Users must apply the fix immediately to stop active exploitation.
Emergency update blocks SYSTEM privilege escalation in WinSock driver
The vulnerability, identified as CVE-2026-68820, resides in the Windows Ancillary Function driver for WinSock. It affects a wide range of Windows versions, including Windows 10 (versions 1607 through 22H2), Windows 11 (versions 23H2 through 26H1), and Windows Server (2012 through 2025). The bug enables locally authenticated attackers to escalate their privileges to the highest system level.
Security researchers classified the issue with a CVSS score of 7.0, indicating high severity. Although the exploit requires high execution complexity, the lack of a workaround means installation of the patch is mandatory. The vulnerability was discovered with assistance from Check Point researchers Moshe Marelus and David Driker.
We looked at the last Windows update earlier while tracking Microsoft security releases, and several of the same balance and stability themes came up. This emergency fix targets a specific driver flaw rather than a broad OS update cycle. The patch closes the gap that attackers are currently using to compromise systems.
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